Comment by teyc

I read a story about Dreame. The founder worked in aerospace, but wanted to make a mass-produced motor with aerospace standards. So he modelled air flow using aerospace tools, built the motor to tight tolerances. Conventional vacuum motors run at 30k rpm, his runs at 100k rpm. Then he standardises on a single motor, for all his devices, robovacs, stick vacs etc, so he gets scale.